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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ba6561657becf42250794a4a54d479370b117a2a1269247cb3f11f453cff58' 
  AND token = 'QT9I9imS+/YE1Xiav5MKq7SU4clFS8mU8bQHrsLuk+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}